应力

A sort of strain sensor that is made of cycloidal stretch film piece and microbent modulation construction and a method of distributed optical fiber strain sensor by Optical Time-Domain Reflectometer are brought forward.

摘要提出了一种用圆形弹膜片和微弯调制机构进行应力传感，用光时域反射探测技术进行测量的分布式光纤应力传感方法。

The results show that dynamic softening is easy to occur in these ingots and flow stress becomes steady finally; the material constants of hot deformation are procedural parameters that stress-level coefficient α, strain rate sensibility exponent m and deformation activation energy Q are all increased with strain increasing, while stress exponent n is decreased gradually; the values α and m of the alloy homogenized are the biggest and the value n is the smallest, dynamic softening effect of the alloy is the most obvious, which can deform evenly; influence of strain on the value Q of the alloy homogenized is a little and the average value of Q is only 176.5kJ/mol, so the alloy is easy to deform; the alloy matrix shows the regular recrystallization grains when the strain is 50%; dislocation cell structure re-formed in the grains with increase of strain.

结果表明：经不同处理的Al-1Mn-1Mg合金均易发生动态软化并最终呈现稳态流变特征；热变形材料常数是过程量，随应变量的增加，应力水平参数α、应变速率敏感性指数m和热变形激活能 Q 随之增大，而应力指数 n 则逐渐减小；均匀化退火后，铝合金的α和m值最大而n值最小，动态软化效果最明显且变形均匀，在该状态下，铝合金的 Q 值受变形量影响小，平均仅为176.5kJ/mol，易进行热变形；当应变量为0.7时，基体呈现规则的再结晶晶粒组织，随着应变量的增加，晶内重新形成了位错胞结构。

The appropriate assembly temperature is related to mechanics properties of material and operating temperature, so reiterative computations are necessary to find an appropriate assembly temperature by the method that makes the maximal tensile stress smallest under conditions that the maximal compressive stress is less than the compressive yield point of material.

安装温度的选择与材料的力学性能及零件的工作温度紧密相关，因此选择合适的安装温度需要反复计算，其方法是在保证循环中的最大压缩应力小于材料压缩屈服点的条件下，使最大拉应力最小。

Objective:Research Experimental animal Brachial plexus Nerve stress relaxation mechanics characteristic,For clinical provides the stress relaxation mechanics characteristic parameter.

目的：研究实验动物臂丛神经的应力松弛力学特性，为临床提供应力松弛力学特性参数。

In composite, the thermal residual stress in the matrix is tensile stress, and that in the particle is contract stress.

在复合材料中，基体中存在拉应力，颗粒中存在压应力。

The phase-averaged waveforms of residual' pulsant Reynolds stress term of coherent structures and Reynolds stress contribution term of random fluctuation during coherent structures burst process were extracted by conditional sampling and phase- average technique.

用条件采样和相位平均技术提取了相干结构碎发过程中相干结构剩余脉动雷诺应力和随机脉动对相干结构贡献的雷诺应力的条件相位平均波形。

In accordance with the needs of solving problems, mold experiments carried out are as follows:(1) Testing flexural normal stress, shearing stress and shearing force stagnant effect of molds of organic glass and load's lateral distribution coefficient of beam's ribs;(2) Testing rigid torsion and distortion effect of molds of organic glass;(3) Testing cap plates' vertical and lateral efficient load working breadth of molds of organic glass;(4) Testing lateral frame's bending moment of molds of organic glass within the range of their working breadth;(5) Experiment on respondency of dynamic force of molds of organic glass.

根据解决问题的需要，所作的模型试验有：⑴测试有机玻璃模型的弯曲正应力、剪应力、剪力滞效应和箱梁梁肋荷载横向分布系数；⑵测试有机玻璃模型的刚性扭转和畸变效应；⑶测试有机玻璃模型顶板纵向、横向荷载有效工作宽度；⑷测试有机玻璃模型载荷在工作宽度范围内的横向框架弯矩；⑸有机玻璃模型的动力响应试验。

A test model of four co-rotating disks was developed as the simplified version of a typical internal cooling system of a gas turbine compressor. The investigation was on the distribution of local heat transfer coefficient and the averaged nusselt number of the downstream main disk. Experimental analysis may lead to following conclusions: the distribution is not of monotony and multi-peaks were found along the disk surface,Nu increases with the decrease of the rotational reynold number Re(subscript w,Nu increases with the axial reynold number and the grasholf number.

针对航空发动机多级压气机盘腔的冷却问题，对具有轴向通流的三腔模型进行了系统的研究，通过对局部换热特性与平均换热特性的分析，可以表征旋转盘的热应力水平和相对冷却效果，结果表明表征旋转盘热应力水平的局部换热特性在旋转盘的半径上呈多峰分布，表征相对冷却效果的平均换热特性与旋转雷诺数Re、进气雷诺数Re以及格拉晓夫数Gr有关，当Re及Gr增加时，平均努塞尔数Nu随之增加，而Re的增加使之减小。

The results show that the drag reduction effect is obvious in turbulent flows due to the riblet surface with the comparsion of the momentum loss thicknesses and wall friction stresses of smooth surface and riblet surface.

通过对比脊状表面与光滑表面动量损失厚度和壁面摩擦应力，反映了动量损失厚度的大小与壁面摩擦应力的大小具有一致性，充分证实了脊状表面在湍流中具有一定的减阻效果。

Also a deep research is made to find an optimal press value of road roller to every depth of pipe culvert.

对于混凝土上埋式圆管涵，设计中要求涵管表面不出现拉应力或只出现很小的拉应力。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷